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<title>30.3 token -- Constants used with Python parse trees</title>
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<h1><a name="SECTION0032300000000000000000">
30.3 <tt class="module">token</tt> --
         Constants used with Python parse trees</a>
</h1>

<p>
<a name="module-token"></a>

<p>
This module provides constants which represent the numeric values of
leaf nodes of the parse tree (terminal tokens).  Refer to the file
<span class="file">Grammar/Grammar</span> in the Python distribution for the definitions
of the names in the context of the language grammar.  The specific
numeric values which the names map to may change between Python
versions.

<p>
This module also provides one data object and some functions.  The
functions mirror definitions in the Python C header files.

<p>
<dl><dt><b><tt id='l2h-5431' xml:id='l2h-5431'>tok_name</tt></b></dt>
<dd>
Dictionary mapping the numeric values of the constants defined in this
module back to name strings, allowing more human-readable
representation of parse trees to be generated.
</dd></dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-5432' xml:id='l2h-5432' class="function">ISTERMINAL</tt></b>(</nobr></td>
  <td><var>x</var>)</td></tr></table></dt>
<dd>
Return true for terminal token values.
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-5433' xml:id='l2h-5433' class="function">ISNONTERMINAL</tt></b>(</nobr></td>
  <td><var>x</var>)</td></tr></table></dt>
<dd>
Return true for non-terminal token values.
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-5434' xml:id='l2h-5434' class="function">ISEOF</tt></b>(</nobr></td>
  <td><var>x</var>)</td></tr></table></dt>
<dd>
Return true if <var>x</var> is the marker indicating the end of input.
</dl>

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    <dt>Module <b><tt class="module"><a href="module-parser.html">parser</a></tt>:</b>
    <dd>The second example for the <tt class="module"><a href="module-parser.html">parser</a></tt>
                     module shows how to use the <tt class="module">symbol</tt>
                     module.
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